Cost & Assurance Accountant

We'll inspire and empower you to deliver your best work so you can evolve, grow and succeed – today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive and diverse team who always strive to do the right thing for our people, clients and communities.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent.

In addition to the benefits you'd expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships. We also give back to our communities through our Collectively program which incorporates matched-funding, paid volunteering time and charitable donations.

Work-life balance and flexibility is a key focus area for us. We're happy to discuss hybrid, part-time and flexible working hours, patterns and locations to suit you and our business.

About the Opportunity

We are the Design and Engineering partner for Sellafield under the PPP (Programme and Project Partners). This is a 20-year arrangement to deliver ~£7bn of major projects. We are looking to recruit high value expertise from across regulated and comparable sectors to work in a collaborative environment. PPP is delivering major projects, site wide improvements and provision of supporting services.

We provide the front end design and engineering capability across the PPP portfolio. Being part of the PPP Team offers a unique opportunity to drive change and innovation in engineering, safety and delivery solutions in one of the most complex industrial sites in the UK if not the world. We are looking for people who are passionate about developing themselves and in meeting new challenges.

We have an exciting opportunity for a Cost and Assurance Accountant to join the team in Birchwood Park, Warrington.

Main duties and responsibilities could include :

• Understand and ensure compliance with the Contract actual cost accounting requirements, Ensure our finance operating processes, accounting standards and governance are followed.
• Participate in preparation of monthly application for payment to the Client in line with contract T&C and assist in development and maintenance of Application for Payment/cost database.
• Raise sales invoices based on approved payment certificates.
• Oversee timely processing and payment of suppliers invoices, maintain subcontractors' invoice and cost trackers, reporting.
• Take part in Client's monthly audits in line with the procedure and mutual assurance of other Partners under the Contract; being involved in preparation of Annual Statement.
• Assist with preparation of projects set up, transactions management throughout the project duration, monthly accruals and projects closure.
• Liaise with Resourcing team re personnel approvals/onboarding/offboarding, use of Resource database to extract audit information, if needed, monitor list of personnel working on the framework.
• Understand build-up of bill rates in line with the contract and assist with calculations and true up, if needed.

As a Cost and Assurance Accountant you will already have:

• Degree/qualification in relevant discipline or can be substituted by relevant experience.
• Accounting/cost experience and understanding is essential
• Used to handling sensitive and confidential information, including treatment of information in line with UK GDPR requirements
• Effective / Competent Computerised systems skills (including Excel) and ability to work with data, spreadsheets and formulae
• Ability to work to multiple deadlines and focused on delivery of best service to the Client and internal stakeholders

Our Culture:

Our values stand on a foundation of safety, integrity, inclusion and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees.

We aim to embed inclusion and diversity in everything we do. We know that if we are inclusive, we're more connected, and if we are diverse, we're more creative. We accept people for who they are, regardless of age, disability, gender identity, gender expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, and whether you're pregnant or on family leave. This is reflected in our wide range of Global Employee Networks centered on inclusion and diversity.

We partner with VERCIDA to help us attract and retain diverse talent. For greater online accessibility, please visit to view and access our roles. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.